Results 1 to 10 of about 274,748 (260)
X-Ray Eclipses of Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2017 Abstract X-ray variation is a ubiquitous feature of active galactic nuclei (AGNs); however, its origin is not well understood. In this paper, we show that the X-ray flux variations in some AGNs, and correspondingly, the power spectral densities (PSDs) of the variations, may be interpreted as being caused by absorptions of eclipsing ...
Youjun Lu +3 more
openaire +5 more sources
The Correlation between X-ray spectral slope and FeKalpha line energy in radio-quiet active galactic nuclei [PDF]
Astrophys.J. 581 (2002) L71-L76, 2002 A significant correlation between FeKalpha line energy and X-ray spectral slope has been discovered among radio-quiet active galactic nuclei. The ionization stage of the bulk of the FeKalpha emitting material is not the same in all active galactic nuclei and is related to the shape of the X-ray continua.
Arnaud K. A. +14 more
arxiv +3 more sources
X-ray absorption and reflection in active galactic nuclei [PDF]
The Astronomy and Astrophysics Review, 2009 Accepted for publication in the Astronomy and Astrophysics Review. 58 pages, 9 figures.
Turner, T, Miller, L
openaire +6 more sources
X-ray absorption in Active Galactic Nuclei [PDF]
arXiv, 2007 We review some of the main physical and statistical properties of the X-ray absorber in AGNs. In particular, we review the distribution of the absorbing column density inferred from X-ray observations of various AGN samples. We discuss the location of the X-ray absorber and the relation with the dust absorption at optical and infrared wavelengths ...
Maiolino, R., Risaliti, G.
arxiv +3 more sources
[C II] emission from galactic nuclei in the presence of X-rays [PDF]
A&A 580, A5 (2015), 2015 The luminosity of [C II] is used to probe the star formation rate in galaxies, but the correlation breaks down in some active galactic nuclei (AGNs). Models of the [C II] emission from galactic nuclei do not include the influence of X-rays on the carbon ionization balance, which may be a factor in reducing the [C II] luminosity. We calculate the [C II]
Langer, William D., Pineda, Jorge L.
arxiv +3 more sources
Sources of X-rays from galaxies [PDF]
, 2011 Galactic X-ray emission is a manifestation of various high-energy phenomena and processes. The brightest X-ray sources are typically accretion-powered objects: active galactic nuclei and low- or high-mass X-ray binaries. Such objects with X-ray luminosities of > 10^{37} ergs/s can now be detected individually in nearby galaxies.
Liu +10 more
arxiv +4 more sources
The infrared--X-ray continuum correlation in active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 The correlation between the soft X-ray and near infrared emission from AGN is analysed using composite models by the code SUMA. We find new evidences for differences in ranges of parameters which characterize the NLR of Seyfert galaxies and LINERs. Results obtained by modelling the Einstein and the ROSAT samples of galaxies are in full agreement.
P. E. Campos +2 more
openaire +5 more sources
Variability and the X-ray/UV ratio of active galactic nuclei [PDF]
Astronomy and Astrophysics, 2010 16 pages, 10 figures, 1 table.
VAGNETTI, FAUSTO +3 more
openaire +8 more sources
Identification of four RXTE Slew Survey sources with nearby luminous active galactic nuclei [PDF]
, 2005 Based on RXTE scans and observations with the SWIFT/XRT telescope and INTEGRAL observatory, we report the identification of four X-ray sources discovered during the RXTE Slew Survey of the |b|>10deg sky with nearby (z ~ 0.017-0.098) luminous (log L_2-10keV ~ 42.7-44 erg/s) active galactic nuclei.
Dickey +10 more
arxiv +4 more sources
X-ray power law spectra in active galactic nuclei [PDF]
Astronomy and Astrophysics, 2010 6 pages, 1 figure, Astronomy and Astrophysics ...
T. J. L. Courvoisier, W. Ishibashi
openaire +5 more sources